feat(ci): GovCloud Layer Workflow

[sthulb]

Issue number: #1166

Summary

Changes

This PR aims to extend the availability of the AWS Lambda Powertools layer to AWS GovCloud regions.

User experience

Before this PR:

• The Lambda Powertools layer is currently not published to AWS GovCloud regions.
• GovCloud users have to manually copy the layer to their accounts as a workaround.

After this PR:

• Include the following GovCloud regions in our layer publication process:
  • us-gov-east-1
  • us-gov-west-1

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• [x] Meet tenets criteria
• [x] I have performed a self-review of this change
• [x] Changes have been tested
• [x] Changes are documented
• [x] PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• [ ] Migration process documented
• [ ] Implement warnings (if it can live side by side)

Acknowledgment

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